N.H. Rev. Stat. Ann. § 426:12

When the commissioner learns of any violation of any provision of this subdivision he or she shall cause notice of such violation, together with a copy of the findings, to be given to the person or persons concerned. Persons so notified shall be afforded a hearing under rules adopted by the commissioner, under RSA 541-A. Affidavits under oath may be received by the commissioner of agriculture, markets, and food.